Xcode 4: Build Failed, No Issues

Question

The app works fine in the simulator, builds and runs.

When I attach my device (iPhone 3GS running iOS 4.3) and target the iPhone, the result is \"Build failed\" with

Answer 1

Are you using "Underscore" and "Space", etc. for Bundle identifier?

Are you using .m instead of .h in one of your imports? #import "Photo.h"